Missouri moves to regulate prediction market platforms

Missouri joins a growing roster of states targeting prediction market platforms

In July, Missouri Attorney General Andrew Bailey sent cease-and-desist letters to prediction market companies operating in the state, telling them their event contracts on sports outcomes constitute illegal gambling under Missouri law. The letters did not name specific companies publicly in the sources available here, but the action places Missouri alongside Connecticut, New York, and Texas in the emerging pattern of states that have decided not to wait for federal resolution.

That pattern is the story the CLARITY Act's collapse made inevitable.

When federal legislation that would have settled the preemption question died in the Senate, it left the Commodity Exchange Act standing alone as Kalshi's primary legal shield — and that shield has spent the weeks since being stress-tested in courts from New York to California. The New York federal judge who questioned the CFTC's claim to exclusive jurisdiction over event contracts is not a minor procedural footnote. That question, put directly to the Commission during oral argument, goes to the foundation of every state enforcement action that a platform might try to block on preemption grounds.

The CFTC's position is that its authority under the Commodity Exchange Act preempts state gambling law when a designated contract market like Kalshi offers event contracts that the Commission has approved. Bailey's position, presumably, is that Missouri's gambling statute applies to Missouri residents regardless of where the platform is incorporated or regulated. Those two positions cannot both be right, and the federal courts have not yet produced a ruling that forecloses either of them.

I have seen this structure before — not in prediction markets, but in earlier fights over swaps regulation and state blue-sky laws. The sequence is consistent: a federal agency claims field preemption, a state AG finds a sympathetic theory under state consumer protection or gaming authority, and the litigation runs in parallel tracks until a circuit produces a ruling broad enough to settle it. That process takes longer than platforms can afford and shorter than regulators prefer.

What makes Missouri worth watching specifically is geography and politics. Bailey is not operating in a judicial district known for expansive readings of federal preemption, and Missouri's gambling statutes were not written with derivatives exchanges in mind. Whether a state court applying Missouri law would read "event contract" as "gambling" is a statutory interpretation question that the Commodity Exchange Act does not answer for them. The federal preemption argument only works if a platform can get into federal court fast enough to stop a state proceeding — and that requires the kind of swift injunctive relief that New York's proceedings suggest is not guaranteed.

The relevant legal standard here is not whether prediction markets are gambling in common understanding. It is whether the CEA's grant of exclusive jurisdiction to the CFTC over "transactions in commodity interests" occupies the field completely enough to displace a state gambling prohibition applied to a CFTC-regulated platform's customers. Courts have generally read field preemption narrowly, requiring clear congressional intent. Whether Congress expressed that intent clearly enough in the Commodity Exchange Act — as amended by Dodd-Frank, without the CLARITY Act's clarifications that never came — is the question Missouri's action will eventually put before a judge.